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Celeriac & Parsnip Mash

Tangy and aromatic, celeriac (or celery root) has long been a staple in French cooking. Here, it's combined with parsnips and russet potatoes for a side dish worthy of your favorite bistro—or trattoria, because we've relocated the dish south, from Paris to Tuscany, using olive oil and Parmesan cheese. The potato is kept separate from the celeriac and parsnip because it gets gluey when pureed in a food processor.

Cooking Directions

Step 1

Place celeriac and parsnips in a large saucepan; cover with lightly salted water. Place potato in a medium saucepan; cover with lightly salted water. Bring both saucepans to a boil over medium-high heat. Reduce heat to low, cover, and simmer gently until the vegetables are very tender when pierced with a fork, about 20 minutes for the potato and 30 to 40 minutes for the celeriac and parsnips.

Step 2

When the potato is tender, drain and transfer to a large bowl. Mash with a potato masher. Cover and keep warm. When the celeriac and parsnips are tender, drain and transfer to a food processor; process until smooth, stopping once or twice to scrape down the sides. Add the puree to the potato.

Step 3

Meanwhile, combine broth and oil in a saucepan (or measuring cup) and heat on the stovetop (or in the microwave) until steaming. Stir into the puree, along with 2 tablespoons chives, yogurt, mustard, salt and pepper. Stir in Parmesan. Garnish with the remaining 1 tablespoon chives. Serve hot.